TDA7265B

Applications

Doc ID 022601 Rev 1

13/18

5.2

Application suggestions for stereo configuration

The recommended values of the external components are those shown in the application

circuit of Figure 12. If different values are used, the following table can be helpful.

Table 5.

Recommended values of the external components in the TDA7265B demonstration

board schematic

Table 6.

Mute, standby truth table

Component

Recomm.

value

Purpose

Larger than

recommended value

Smaller than

recommended value

R1

10 k

Ω

Mute circuit

Increase of Dz biasing current

R2

15 k

Ω

Mute circuit

R3

18 k

Ω

Mute circuit

R4

15 k

Ω

Mute circuit

R5, R8

18 k

Ω

1.

Closed-loop gain has to be

≥ 29 dB

Increase of gain

R6, R9

560

Ω

Decrease of gain

R7, R10

4.7

Ω

Frequency stability

Danger of oscillations

Danger of oscillations

C1, C2

1 µF

Input DC decoupling

Higher low-frequency cutoff

C3

1 µF

St-By/Mute time constant

Larger on/off time

Smaller on/off time

C4, C6

1000 µF

Supply voltage bypass

Danger of oscillations

C5, C7

0.1 µF

Supply voltage bypass

Danger of oscillations

C8, C9

0.1 µF

Frequency stability

Dz

5.1 V

Mute circuit

Q1

BC107

Mute circuit

SW1

SW2

B

A

Standby

B

B

Standby

AA

Mute

AB

Play